163994186 has 16 divisors (see below), whose sum is σ = 262151424. Its totient is φ = 76762224.

The previous prime is 163994183. The next prime is 163994191. The reversal of 163994186 is 681499361.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 163994186.

It is not an unprimeable number, because it can be changed into a prime (163994183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35765 + ... + 40088.

It is an arithmetic number, because the mean of its divisors is an integer number (16384464).

Almost surely, 2^163994186 is an apocalyptic number.

163994186 is a deficient number, since it is larger than the sum of its proper divisors (98157238).

163994186 is a wasteful number, since it uses less digits than its factorization.

163994186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75925.

The product of its digits is 279936, while the sum is 47.

The square root of 163994186 is about 12806.0214742909. The cubic root of 163994186 is about 547.3638990877.

The spelling of 163994186 in words is "one hundred sixty-three million, nine hundred ninety-four thousand, one hundred eighty-six".